MIL-PRF-49291D
4.2 Verification program. A verification program shall be established and maintained in accordance
with MIL-STD-790 or comparable standard. Evidence of such compliance shall be verified by the
qualifying activity of this specification as a prerequisite for qualification and continued qualification.
Results of audits to MIL-STD-790 equivalent quality assurance standards by third parties shall be
available to the Government for review. The verification system procedures, planning, and all other
documentation and data that comprise the verification system shall be available to the Government for
review. The Government may perform any necessary inspections, verifications, and evaluations to
ascertain conformance to the requirements and the adequacy of the implementing procedures.
4.3 Test equipment and inspection facilities. Provision for test and measuring equipment and
inspection facilities of sufficient accuracy, quality, and quantity to permit performance of the required
inspections shall be the responsibility of the contractor. The establishment and maintenance of a
calibration system to control the accuracy of the measuring and test equipment shall be in accordance
with NCSL Z540.3 or comparable standard.
4.4 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance
with the standard test conditions specified in TIA/EIA-455.
4.5 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to
the Government (see 6.3) on sample units produced with equipment and procedures normally used in
production. Group qualification shall be as specified in 4.5.2.
4.5.1 Sample. A finished optical fiber sample shall be submitted for each fiber construction (see 3.1)
for which qualification is desired (see 6.3.2). The sample size, unless otherwise specified (see 3.1),
submitted shall be 3 units each of 2.2 km minimum lengths with no splices.
4.5.2 Group qualification. In instances where two or more fibers are identical in materials and
construction except for attenuation, the fiber with the lowest attenuation range shall be submitted and
shall meet all the requirements of this specification and the specification sheet (see 3.1). Qualification
may be extended to include those fibers with higher attenuation provided the samples submitted in
accordance with 4.5.1 meet the attenuation and fiber size specified in the specification sheet.
4.5.3 Inspection routine. The samples shall be subjected to the qualification inspection specified in
table I. Group I inspections may be performed in any order, however groups II and III inspections shall
be performed in the order shown. In cases where certain requirements and tests are applicable only
when specified (see 3.1), these tests shall be conducted in the order shown when specified in the
appropriate specification sheet (see 3.1). Tests which are not specified as applicable to a specific fiber
construction shall not be conducted. All sample units shall be subjected to the inspection of group I.
Specimens shall be cut from each sample unit in lengths at least as long as specified in table I. Test
specimens from each sample unit shall be subjected to the tests of groups II and III, of table I; however,
each test specimen shall be subjected to only one group of tests in addition to group I.
4.5.4 Failures. One or more failures shall be cause for refusal to grant qualification approval.
4.5.5 Retention of qualification. To retain qualification, the contractor shall verify in coordination with
the qualifying activity the capability of manufacturing products which meet the performance requirements
of this specification. Refer to the qualifying activity for the guidelines necessary to retain qualification to
this particular specification. The manufacturer shall immediately notify the qualifying activity at any time
that the inspection data indicates failure of the qualified product to meet the performance requirements of
this specification.
4.6 Conformance inspection. Conformance inspection shall consist of the inspections and tests
specified for group A inspection (see table II), group B inspection (see table III), and group C inspection
(see table IV). Requests for alternate forms of conformance inspection shall be submitted to the
qualifying activity. Alternate forms of conformance inspection may be used upon written approval by the
qualifying activity.
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